python - Assigning complex values to numpy arrays?

Question

This gives the expected result

x = random.rand(1) + random.rand(1)*1j
print x.dtype
print x, x.real, x.imag

and this works

C = zeros((2,2),dtype=complex)
C[0,0] = 1+1j
print C

but if we change it to

C[0,0] = 1+1j + x

I get "TypeError: can't convert complex to float".

If we now omit the explicit dtype = complex, I get "ValueError: setting an array element with a sequence".

Can someone explain what's going on, and how to do this without errors? I'm lost.

Answer 1

Actually, none of the proposed solutions worked in my case (Python 2.7.6, NumPy 1.8.2). But I've found out, that change of dtype from complex (standard Python library) to numpy.complex_ may help:

>>> import numpy as np
>>> x = 1 + 2 * 1j
>>> C = np.zeros((2,2),dtype=np.complex_)
>>> C
array([[ 0.+0.j,  0.+0.j],
       [ 0.+0.j,  0.+0.j]])
>>> C[0,0] = 1+1j + x
>>> C
array([[ 2.+3.j,  0.+0.j],
       [ 0.+0.j,  0.+0.j]])